====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.285/5677 is trying to acquire lock: ffff888078ec1d38 (&iint_mutex_key[depth]){+.+.}-{3:3}, at: process_measurement+0x724/0x1c20 security/integrity/ima/ima_main.c:261 but task is already holding lock: ffff888024754128 (&common->filesem){++++}-{3:3}, at: fsg_store_file+0x174/0x530 drivers/usb/gadget/function/storage_common.c:451 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&common->filesem){++++}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 fsg_show_file+0x29/0x130 drivers/usb/gadget/function/storage_common.c:338 fill_read_buffer fs/configfs/file.c:68 [inline] configfs_read_iter+0x296/0x560 fs/configfs/file.c:88 __kernel_read+0x51d/0x980 fs/read_write.c:443 integrity_kernel_read+0x86/0xd0 security/integrity/iint.c:228 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x946/0x1940 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x335/0x7e0 security/integrity/ima/ima_api.c:255 process_measurement+0x1185/0x1c20 security/integrity/ima/ima_main.c:351 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533 do_open fs/namei.c:3661 [inline] path_openat+0x27cf/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&p->frag_sem){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 fill_read_buffer fs/configfs/file.c:66 [inline] configfs_read_iter+0x19e/0x560 fs/configfs/file.c:88 __kernel_read+0x51d/0x980 fs/read_write.c:443 integrity_kernel_read+0x86/0xd0 security/integrity/iint.c:228 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x946/0x1940 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x335/0x7e0 security/integrity/ima/ima_api.c:255 process_measurement+0x1185/0x1c20 security/integrity/ima/ima_main.c:351 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533 do_open fs/namei.c:3661 [inline] path_openat+0x27cf/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&buffer->mutex){+.+.}-{3:3}: __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 configfs_read_iter+0x6e/0x560 fs/configfs/file.c:86 __kernel_read+0x51d/0x980 fs/read_write.c:443 integrity_kernel_read+0x86/0xd0 security/integrity/iint.c:228 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x946/0x1940 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x335/0x7e0 security/integrity/ima/ima_api.c:255 process_measurement+0x1185/0x1c20 security/integrity/ima/ima_main.c:351 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533 do_open fs/namei.c:3661 [inline] path_openat+0x27cf/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&iint_mutex_key[depth]){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3120 [inline] check_prevs_add kernel/locking/lockdep.c:3239 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 process_measurement+0x724/0x1c20 security/integrity/ima/ima_main.c:261 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533 do_open fs/namei.c:3661 [inline] path_openat+0x27cf/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 file_open_name fs/open.c:1200 [inline] filp_open+0x17c/0x1e0 fs/open.c:1220 fsg_lun_open+0x63/0xee0 drivers/usb/gadget/function/storage_common.c:193 fsg_store_file+0x1a5/0x530 drivers/usb/gadget/function/storage_common.c:454 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &iint_mutex_key[depth] --> &p->frag_sem --> &common->filesem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&common->filesem); lock(&p->frag_sem); lock(&common->filesem); lock(&iint_mutex_key[depth]); *** DEADLOCK *** 5 locks held by syz.5.285/5677: #0: ffff88802afc6ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1056 #1: ffff88801e6e2460 (sb_writers#23){.+.+}-{0:0}, at: vfs_write+0x296/0xd70 fs/read_write.c:590 #2: ffff888079789c88 (&buffer->mutex){+.+.}-{3:3}, at: configfs_write_iter+0x7d/0x400 fs/configfs/file.c:226 #3: ffff88802409dc78 (&p->frag_sem){.+.+}-{3:3}, at: flush_write_buffer fs/configfs/file.c:205 [inline] #3: ffff88802409dc78 (&p->frag_sem){.+.+}-{3:3}, at: configfs_write_iter+0x20e/0x400 fs/configfs/file.c:229 #4: ffff888024754128 (&common->filesem){++++}-{3:3}, at: fsg_store_file+0x174/0x530 drivers/usb/gadget/function/storage_common.c:451 stack backtrace: CPU: 1 PID: 5677 Comm: syz.5.285 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3120 [inline] check_prevs_add kernel/locking/lockdep.c:3239 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 process_measurement+0x724/0x1c20 security/integrity/ima/ima_main.c:261 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533 do_open fs/namei.c:3661 [inline] path_openat+0x27cf/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 file_open_name fs/open.c:1200 [inline] filp_open+0x17c/0x1e0 fs/open.c:1220 fsg_lun_open+0x63/0xee0 drivers/usb/gadget/function/storage_common.c:193 fsg_store_file+0x1a5/0x530 drivers/usb/gadget/function/storage_common.c:454 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f18e068b559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f18de8e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f18e0911fa0 RCX: 00007f18e068b559 RDX: 0000000000000005 RSI: 00002000000003c0 RDI: 0000000000000004 RBP: 00007f18e0722b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f18e0912038 R14: 00007f18e0911fa0 R15: 00007ffc3191b498